Extended Data Fig. 1. Histograms of average diameters of fine-grained Ryugu samples investigated in this study.
Grains recovered from both (a) 1st and (b) 2nd touchdown (landing) sites (TD1 and TD2) have a skewed size distribution. No clear differences are observed between size distributions of non-space weathered (blue bins) and space weathered (red bins) grains in both touchdown sites. The proportions of grains with smooth layers, frothy layers, and melt splashes on non-space weathered surfaces are expressed as percentages in both (a) and (b). Bin ranges are 10 µm.